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Geoffrey M. Boynton, Robert O. Duncan; Visual acuity correlates with cortical magnification factors in human V1. Journal of Vision 2002;2(10):11. doi: https://doi.org/10.1167/2.10.11.
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We show that visual acuity in humans is limited by the amount of primary visual cortex (V1) devoted to a region of the visual field, called the linear cortical magnification factor (M). We used fMRI to measure M in V1, and two psychophysical tasks to measure acuity (Vernier and grating) in the same ten observers. Across observers, the decrease in M with increasing eccentricity predicts the corresponding decrease in acuity for both tasks. Furthermore, observers with lower grating acuity thresholds, measured with laser interferometry, had a significantly greater overall M. These results establish faithful estimates of cortical limits to visual acuity.
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